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INTEROFFICE MEMORANDUM <br />TO: CLAYTON WEIN AND JIM STARK <br />FROM: ROB ZUBER I, ..' <br />SUBJECT: DESERADO XIR-166, FOLLOW-UP ON FIRST ADEQUACY LETTER <br />DATE: 10/15/2015 <br />Gents — <br />You asked me to compare flow out of the ponds that makeup the proposed system to flow out of the pond in the existing <br />system. In my previous memo, I said that I cannot make that comparison because there is nothing in the PAP for the <br />existing system. While I was correct that there is no SEDCAD analysis, nor is there a significant record of flows from <br />the surface water monitoring data, I have had another thought about this, and I think that I can answer your question. <br />Clayton pointed me to page N-37, which states that the current design flow for this de -watering system is 307 gpm, <br />which is discharge from SDH -3, not counting any runoff from storms. With MR -166, they are saying that the discharge <br />from SDH -3 will be 350 gpm. So, that is the simple answer to your question: when the system reaches a steady state <br />(flow in equals flow out), the discharge will increase from 307 gpm to 350 gpm (an increase of 14%). Given the fact that <br />the new system will have more capacity to hold runoff from storms (three ponds rather than one), this percent increase <br />will be less when you combine the flow from the workings and runoff from a storm. Let me know if you want me to try <br />to quantify this (there may not be enough information regarding the current pond to do this). <br />Regarding our adequacy comments, Blue Mountain has sufficiently answered #4 and #5 <br />I am available to discuss this at your leisure. <br />Rob <br />